/* FCE Ultra - NES/Famicom Emulator
 *
 * Copyright notice for this file:
 *  Copyright (C) 2002 Xodnizel
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * FDS Conversion
 *
 */

#include "mapinc.h"


static DECLFW(Mapper40_write) {
	switch (A & 0xe000) {
	case 0x8000: IRQa = 0; IRQCount = 0; X6502_IRQEnd(FCEU_IQEXT); break;
	case 0xa000: IRQa = 1; break;
	case 0xe000: ROM_BANK8(0xc000, V & 7); break;
	}
}

static void FP_FASTAPASS(1) Mapper40IRQ(int a) {
	if (IRQa) {
		if (IRQCount < 4096)
			IRQCount += a;
		else{
			IRQa = 0;
			X6502_IRQBegin(FCEU_IQEXT);
		}
	}
}

void Mapper40_init(void) {
	ROM_BANK8(0x6000, (~0) - 1);
	ROM_BANK8(0x8000, (~0) - 3);
	ROM_BANK8(0xa000, (~0) - 2);
	SetWriteHandler(0x8000, 0xffff, Mapper40_write);
	SetReadHandler(0x6000, 0x7fff, CartBR);
	MapIRQHook = Mapper40IRQ;
}


